Stillwater County, Montana · Frost dates
Stillwater County frost dates.
First-frost, last-frost, and growing-season length for Stillwater County, Montana. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 4b
32°F — light freeze
Last spring frost
- 10%
- 06-12
- 20%
- 06-05
- 50%
- 05-27
- 80%
- 05-18
- 90%
- 05-14
First fall frost
- 10%
- 09-01
- 20%
- 09-05
- 50%
- 09-14
- 80%
- 09-23
- 90%
- 09-28
28°F — killing freeze
Last spring freeze
- 10%
- 05-27
- 20%
- 05-23
- 50%
- 05-13
- 80%
- 05-05
- 90%
- 04-30
First fall freeze
- 10%
- 09-11
- 20%
- 09-17
- 50%
- 09-26
- 80%
- 10-04
- 90%
- 10-09
Growing season length (days, 28°F threshold)
- Short year
- 107
- Median
- 136
- Long year
- 162
Source NOAA station
COLUMBUS, MT US
5.6 mi · 30 yrs of record (1991–2020) · 3602 ft elev.
Data from COLUMBUS, MT US, 5.6 miles away with 30-year NOAA record (1991-2020).
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